Seam for bags



Niw. 26, 1935;

l illl Patented Nov. 26, 1935 UNITED STATES 2,022,501 SEAM F'oa BAGS JosephD. Cramer, Goshen, Ind., assignor to The Chase Bag Company, New York, N. 1., a corporation of Delaware Application December 13, 1934, Serial No. 151,345 7 1 Claim. (L 150-1) My invention relates to bags or sacks 'and is an improvement pertaining more particularly to lined heavy duty bags in which the body of the bag is composed of an outer covering and an 5 inner preferably air tight and liquid tight stretchable lining. The outer covering of such bags is ordinarily made of textile fabric such as burlap to withstand rough handling whereas the] inner lining consists of a sheet of creped paper or other similar material ordinarily connected to the outer covering by a waterproof binder such as asphaltum. Bags of the type described herein are frequently subjected to intense heat, and it has been found that the asphaltic material, connecting the lining to the burlap, would soften as a result of the heat, penetrate the burlap and permit of the liner being partly separated from its covering, and then quickly deformed and destrayed. e

It is the primary object of this invention to eliminate the difficulty mentioned above by providing a lined, sturdy and waterproof bag of the type referred to with a muiLi-ply waterproof liner, which liner is secured to the covering by means of a paste which will not be softened by heat.

The liner is made of a plurality, usually two, of

sheets of creped paper or other suitable'material .30 between which is interposed a layer of suitable waterproofing material, usually of an asphaltum nature. However, these sheets, which are slightly shiftable with respect to each other especially when the bag is subjected to heat, and 85 the asphaltic material softened, should be so secured to each other as to insure their compound action and should also be secured to the outer covering so as to properly protect and cover the seam of the outer covering. 40 It is therefore another object of this invention to provide a lined, sturdy and waterproof bag of the type referred to with a multi-ply waterproof liner in which each ply issecured to the covering and to one of the plies by means of a suitable 45 paste such as a latex-adhesive having a greater resistance to the softening action of heat than asphaltum which will not be softened by heat. This desideratum is obtained by. overlapping sheets of the liner so that there are no end pct-- 50 tions of the liner which are secured in place only by the asphaltic material but by paste means which will not be softened by heat.

With the foregoing and other objects in view, theinvention comprises the novel construction,

55 combination and arrangement of parts herelnafter more specifically described and illustrated in the accompanying drawin wherein is shown a preferred embodiment of the invention.

The novel features that I consider characteristic of my invention are set forth with particu- 5 larity in the appended claim.

In the drawing:

Figure 1 is a plan view of a multi-ply paper lined burlap bag according to the invention, the diflerent layers of the outer covering and inner; 10 multi-ply lining member being partly broken away to disclose the construction of the bag and its seam; and b Figure 2 is an enlarged fragmentary sectional view through-the seam of the bag, the section 15 being taken on line 2-2 of figure. y

The bag is formed from a composite sheet including an outer layer of woven fabric 3, such as burlap. This outer layer carries an inner twoply lining member 4 fastened thereto by means 20 of a layer of waterproof binder. The liner 4 preferably consists of two smooth sheets of tough, thin and creped paper 8 and 1, which' sheets are secured together by means of an interposed layer cf waterproof binder 8, such as as- 25 pha'ltum. v,

The web of material from which the bags are made from tube sections formed in tubing machines of old and well known construction com prises the outer burlap covering 3 and the lining member 4. This web is folded at 9 and I0 and joined by'an overlapping seam ll, arranged in the middle of the seamed side wall l2 of the bag. In this seam the edges ll, l5 of the outer fabric layer 3 overlap each other and are pasted to-- gether by means of a layer I6 of a waterproof hinder or paste, which will not be softened by.

'heat. To facilitate the overlapping of the layer or covering 3 and the pasting together of the edges I4 and I, the layer ,3 and the lining mem- 40 her 4 are laterally offset with respect to each other, that is. one edge of the fabric extends beyond the corresponding edge of the liner to form an unlined marginal portion ll, which is folded upon and pasted to the other edge of the fabric.

. In the liner 4, made from the sheets 8 and l secured together by the asphaltic binder 8, the outer sheet I is somewhat wider than its companion sheet 0 to provide extended portions or strips l8 and I! at opposite ends of said outer sheet. These strips project beyond the asphaltic binder 8 between the sheets 6 and l and are connected by waterproof, heat resisting paste to the outer of the sheets 6 and I and of the fabric 3 are then pressed together, and thus form the above described seam of the bag. After making of the scam in the way described, the bottom and neck portions of the said bag are formed in any desired manner.

From the foregoing it is plain that the'end portions of the sheets of the liner and of the covering are permanently secured in place by means of paste, which will withstand intense heat and consequently the bag will stand up under abusive wear and extensive heat, present for example in filling the bag with hot cement by filling machines, all as now generally practised. The fact that the waterproof asphaltic binder is enclosed by sheets of paper is of great importance, as this construction prohibits penetration of the fabric material with asphaltic paste. Such penetration of the fabric material with paste would weaken the waterproofness of the bag and make same sticky and hard to handle. The thickness of the seam of a bag constructed in accordance with the invention is hardly increased, as the overlapping areas of the liner are widely spread. Th lining of a bag of this type is much stronger and will more easily give under stresses due to the fact that the two ply paper liner permits of a higher degree of relative movements of the liner with 5 respect to the cover than a single liner which is directly pasted to the outer covering.

Although I have shown and described certain specific embodiments of the invention, I am fully aware that modifications thereof are possible. My

1 invention, therefore, is not to be restricted except insofar as is necessitated by the prior art and the spirit of the appended claims.

Having thus described my invention:

What I claim is:

A double walled bag formed of textile fabric and a multiply, creped paper lining the plies of which are secured together by a layer of asphalticv material, said fabric and paper lining being secured together over their entire opposed surfaces by a binder having .a greater resistance to the softening action of heat than asphaltum, said textile fabric and liner being laterally offset with respect to each other to provide a fabric to fabric seam having its layers secured together by a layer of said heating resisting binder, and one of said plies of paper being wider than the other to form extending strips of paper, said extending strips of paper being secured to said ply and to the fabric by a layer of said heat resisting binder.

' JOSEPH D. CRAMER. 

